Boom-derrick



UNITED sTATEs PATENT oEEicE.

GEO. E. VARNER, OF SPRINGFIELD, MASSACHUSETTS.

BOOM-DERRICK.

Specification of Letters Patent No. 6,515, dated June 5, 1849.

T 0 all whom t may concern:

Be it known that I, GEORGE E. IVARNER, of Springfield, of the county ofHampden and State of Massachusetts, have invented a new and usefulImprovement of a Mason- Tender or Hoisting-Machine; and I do herebydeclare that the following is a true, full, and accurate description ofmy invention, reference being had therein to the annexed drawings, whichform a part of this specification and of which* Figure l is aperspective front view of the machine. Fig. 2 is a section of the sametaken on the line 2, z, Fig. l. Fig. 3 is a section of the hod orelevator, J, and the draw-bolt and lever, Z and m. Fig. 4 is atransverse section of the drum, F.

Similar letters of reference indicate the same parts.

The nature of my invention consists of a combination and arrangement ofmachinery for raising bricks, mortar and other building materials forbuildingsin the process of erect-ion, whereby is e'ected a great economyof time and labor in the operation as compared with the ordinary modeso-f performing the work.

That others may understand and apply my invention, I shall proceed todescribe its construction and operation. y

Near the building to be erected I plant a shaft or mast, A, firmly inthe ground, and of such height as may be required, usually about sixtyfeet more or less, as shown in Figs. l and 2.

At the foot of this shaft I make a frame, B, which is a circular rim orplatform of iron or wood surrounding the shaft and resting upon fourshort and stout posts C, C, C, C, which set upon the ground. The lowerside or edge of the rim of a horizontal wheel, D, rests upon four ormore pulleys or trucks, a, fixed in the circular frame, B, on which itruns when revolved about the shaft, A, as subsequently explained; and onthe upper edge of the wheel, D, are cogs, which mesh into a. verticalcog-wheel, E, which forms one end or head of a cylindrical windlass ordrum, F, that issupported by a strong wrought iron frame, Gr, securedfirmly to the mast, A, as shown in Figs. 1 and 2.

In a machine for ordinary building purposes I make about twenty feet ofthe upper end of the mast, A, of uniform size, forming a shoulder say atabout forty feet from the ground. At this point I usually fasten an ironcollar, Z), by means of a bolt passing through a hole in the said mast;and to this collar are aiiixed two iron arms H, H, which project forwardhorizo-ntally over the windlass or drum, F; and immediately over thecollar, b, I rig a long and stiff' cross beam, I, I, which is suspendedon the shaft, A, by a collar, c, that sets upon the collar, or isseparated'from it only by a friction washer, which it may beadvantageous to place between the said collars. The cross-beam I, I,thus suspended rotates on the mast, A, as subsequently explained.

Near the middle of both sides of the crossbeam, I, I, are fastened staysor brace-chains, (Z, d, which pass down to and are secured to the ironrods, e, which rods play loosely on the mast, A, within the spaceembraced by the loop lw but are prevented from slipping upward thereonby the bolts, f, which secure them to the mast at the lower end, asshown in the Figs. l and 2.

In the drum, F, is a shaft, 0a, to which is attached two ropes g, g,that are wound upon it and pass out through holes in opposite sides ofthe drum, as represented in Fig. 2, and as will be more fully explainedhereafter. The ropes, g, g, go upward from the drum, F, as shown in Fig.l, over pulleys, L, z, fixed in the frame, G, to pulleys, z', z', ateach end of the cross-beam, I, I, and passing over them are attached tobod-boxes or elevators, J, J, which they raise and lower to and fromstands or frames, K, K, placed on the ground directly under the pulleysi, z', in the manner and for the purpose subsequently explained. Nearthe middle of both sides of the cross-beam, I, I, are fastened tworopes, .7', j, one to each, which pass over pulleys on the ends of thearms, H, H, and thence down to the frame B.

Having described the principal members and the arrangement of myhoisting machine, I will now further explain some details in itsconstruction and its mode of operation On opposite sides of the wheel,D, which is made of cast iron, are fixed two or more projecting arms,la, 7.a, which serve as handles to turn the said wheel. The machine isoperated by men, who taking hold of the handles, 7c, 7c, turn the wheelD, which rests and runs upon the trucks, a, that are fixed in the frame,B, and thus they give motion to the windlass or drum, F, by means of thecog wheel, E. The drum F, beingl thus turned, one of the ropes g, g, iswound upon it, and passing over the pulleys z., h, fixed in the frame,Gr, or one of them, to one of the pulleys z', z', at the ends of thecrossbeam I, I, it raises one of the elevators, J, J, from one of thestands K, K, where it is filled with briclrs, mortar or other buildingmaterial, and thus hoists the elevator up to a level with the scaffoldon which the masons are at work. IVhen either of the elevators has inthis manner been hoisted to a level with the scaffold, it is drawn on itby means of the ropes j, y', which being pulled from below, the one orthe other of them as the case may be, the cross-beam I, I, is swungaround over the right point for depositing the contents of the loadedelevator. Vhile one elevator ascends the other descends, and thusalternately they are filled, hoisted up, emptied and lowered again.

The elevators are made with trap bottoms for dumping or dischargingtheir contents from beneath, which is effected by a selfactingdraw-bolt, Z, that is drawn when the loaded elevator touches thescaffold, by the action of a lever, m, connected with it, which simplecontrivance for discharging the contents of the elevators is a commondevice for similar purposes, and therefore needs no further descriptionof the arrangement, but which is new in its application to this specialobject, and is represented in an enlarged view by Fig. 3.

The hoisting apparatus admits of being adjusted to the work at differentelevations, by raising or lowering the cross-beam, I, I, and the collar,b and rods e, equidistant holes being made through the mast, A, for thereception of the bolt which secures said collar, as shown in Fig.' l.

In order to supply an additional length of rope to the elevators whenthe hoisting apparatus is to be raised, there is a shaft, 0a, beforereferred to, in the drum, F, on which are wound the ropes, g, g, anyrequired length, to be unwound only when needed for the purpose justmentioned.

The ropes, g, g, are made long enough to permit the cross-beam, I, I, tobe raised to the top of the shaft, A, when required, but when thecross-beam is at the lowest point at which it is rigged, as representedin the Fig. 1, the ropes, g, g, are wound around the shaft, x, in thedrum, F, by means of a crank attached to one end as shown at, a, in Fig.2. The shaft, is prevented from turi'iing when the ropes, g, g, arewound upon it, by means of a ratchet wheel, 0, at oneend, on the insideof the drum, F, which is secured and held in the ordinary manner by akey, 29, as represented in Fig. 4, but requiring no further explanation.

Having thus fully explained my invention, what I claim therein as newand desire'to secure by Letters Patent isj The drum F, as constructed,with its inner shaft with its arrangement for giving independent motionby means of which the ropes can be housed and protected, in combinationwith the adjustable rotary cross beam I, I, arranged and operated asdescribed by means of which combination and arrangement I am enabled tohave in wear only such portions of the ropes as the operation of themachine and the varying elevation of the wall or structure may demand.

GEORGE E. WARNER. Witnesses:

S. II. WALES, O. D. MUNN.

